As an educated guess you could probably take 0.5mm off the 200 head & at least get the squish almost working & a bit of a compression increase, as long as you never run less than 95 gas you should be fine. Think on mine I removed one of the 2 base gaskets & skimmed 0.9 but I did have to scoop a bit out as comm went up to 15.5:1
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